AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
MARCH 30, 2001
2-18-50
Page
3
Code
01
LIGHTNING DETECTION MODE (LX)
When operating in Lightning Detection Mode, the Lightning Sensor
System is fully operational and lightning strikes are collected,
processed, and displayed.
The LSS shows areas of lightning activity with white lightning symbols,
which represents the center of a circular area with a radius of nine
nautical miles. Three different lightning symbols are used to represent
three different lightning rates-of-occurrence within each 18-mile
diameter cycle.
Because of the large variation in lightning electromagnetic discharge,
sometimes the system can not determine, within its occurring criteria,
lightning bearing and distance. Rather, only the bearing is measured.
Activity that only provides bearing information is presented in magenta
lightning symbols near the outer range marks.
When operating the LSS with the Radar in STBY Mode, 360º of data is
displayed.
A green LX will be displayed on normal operation.
Lightning Sensor Display symbology is as follows:
LEVEL LIGHTNING CATEGORY
1 white headless lightning symbol
2 white single-headed lightning symbol
3 white double-headed lightning symbol
ALERT magenta headless lightning symbol
CLEAR/TEST MODE (CLR/TST)
When the Clear/Test mode is selected, all lightning rate symbols are
erased from the display and a special pattern is displayed to allow
verification of the Lightning Sensor System operation.
The Test must be accomplished by selecting 50 NM or a greater
display range and the CLR/TST Mode. The LSS CLR/TST Mode can
be selected in any radar mode.
In the event of a failure, an amber LXmn will be displayed, where mn is
a failure code, which will help the technician in troubleshooting the
system.
When CLR/TST mode is selected, a green LX/CL is displayed on the
MFDs and, after three seconds, LX/CL is replaced by LX/T.
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